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Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7a79d717 | 2 | /* Copyright (C) 2007-2019 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
c6c8fea2 SE |
5 | */ |
6 | ||
c6c8fea2 | 7 | #include "routing.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
10 | #include <linux/atomic.h> | |
11 | #include <linux/byteorder/generic.h> | |
12 | #include <linux/compiler.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/if_ether.h> | |
16 | #include <linux/jiffies.h> | |
a6ba0d34 | 17 | #include <linux/kref.h> |
1e2c2a4f SE |
18 | #include <linux/netdevice.h> |
19 | #include <linux/printk.h> | |
20 | #include <linux/rculist.h> | |
21 | #include <linux/rcupdate.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/stddef.h> | |
fec149f5 | 25 | #include <uapi/linux/batadv_packet.h> |
1e2c2a4f SE |
26 | |
27 | #include "bitarray.h" | |
23721387 | 28 | #include "bridge_loop_avoidance.h" |
c384ea3e | 29 | #include "distributed-arp-table.h" |
610bfc6b | 30 | #include "fragmentation.h" |
1e2c2a4f SE |
31 | #include "hard-interface.h" |
32 | #include "icmp_socket.h" | |
ba412080 | 33 | #include "log.h" |
1e2c2a4f SE |
34 | #include "network-coding.h" |
35 | #include "originator.h" | |
1e2c2a4f SE |
36 | #include "send.h" |
37 | #include "soft-interface.h" | |
33a3bb4a | 38 | #include "tp_meter.h" |
1e2c2a4f | 39 | #include "translation-table.h" |
1f8dce49 | 40 | #include "tvlv.h" |
c018ad3d | 41 | |
63b01037 | 42 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 43 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 44 | |
7351a482 | 45 | /** |
7e9a8c2c | 46 | * _batadv_update_route() - set the router for this originator |
7351a482 SW |
47 | * @bat_priv: the bat priv with all the soft interface information |
48 | * @orig_node: orig node which is to be configured | |
49 | * @recv_if: the receive interface for which this route is set | |
50 | * @neigh_node: neighbor which should be the next router | |
51 | * | |
52 | * This function does not perform any error checks | |
53 | */ | |
56303d34 SE |
54 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
55 | struct batadv_orig_node *orig_node, | |
7351a482 | 56 | struct batadv_hard_iface *recv_if, |
56303d34 | 57 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 58 | { |
7351a482 | 59 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 60 | struct batadv_neigh_node *curr_router; |
e1a5382f | 61 | |
7351a482 SW |
62 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
63 | if (!orig_ifinfo) | |
64 | return; | |
65 | ||
b5dcbad2 SE |
66 | spin_lock_bh(&orig_node->neigh_list_lock); |
67 | /* curr_router used earlier may not be the current orig_ifinfo->router | |
68 | * anymore because it was dereferenced outside of the neigh_list_lock | |
69 | * protected region. After the new best neighbor has replace the current | |
70 | * best neighbor the reference counter needs to decrease. Consequently, | |
71 | * the code needs to ensure the curr_router variable contains a pointer | |
72 | * to the replaced best neighbor. | |
73 | */ | |
74 | curr_router = rcu_dereference_protected(orig_ifinfo->router, true); | |
75 | ||
76 | /* increase refcount of new best neighbor */ | |
77 | if (neigh_node) | |
78 | kref_get(&neigh_node->refcount); | |
79 | ||
80 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); | |
81 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
82 | batadv_orig_ifinfo_put(orig_ifinfo); | |
a8e7f4bc | 83 | |
c6c8fea2 | 84 | /* route deleted */ |
825ffe1f | 85 | if (curr_router && !neigh_node) { |
39c75a51 SE |
86 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
87 | "Deleting route towards: %pM\n", orig_node->orig); | |
95fb130d | 88 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 89 | "Deleted route towards originator"); |
c6c8fea2 | 90 | |
e1a5382f | 91 | /* route added */ |
825ffe1f | 92 | } else if (!curr_router && neigh_node) { |
39c75a51 | 93 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
94 | "Adding route towards: %pM (via %pM)\n", |
95 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 96 | /* route changed */ |
bb899b89 | 97 | } else if (neigh_node && curr_router) { |
39c75a51 | 98 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
99 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
100 | orig_node->orig, neigh_node->addr, | |
101 | curr_router->addr); | |
c6c8fea2 SE |
102 | } |
103 | ||
e1a5382f LL |
104 | /* decrease refcount of previous best neighbor */ |
105 | if (curr_router) | |
25bb2509 | 106 | batadv_neigh_node_put(curr_router); |
c6c8fea2 SE |
107 | } |
108 | ||
7351a482 | 109 | /** |
7e9a8c2c | 110 | * batadv_update_route() - set the router for this originator |
7351a482 SW |
111 | * @bat_priv: the bat priv with all the soft interface information |
112 | * @orig_node: orig node which is to be configured | |
113 | * @recv_if: the receive interface for which this route is set | |
114 | * @neigh_node: neighbor which should be the next router | |
115 | */ | |
56303d34 SE |
116 | void batadv_update_route(struct batadv_priv *bat_priv, |
117 | struct batadv_orig_node *orig_node, | |
7351a482 | 118 | struct batadv_hard_iface *recv_if, |
56303d34 | 119 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 120 | { |
56303d34 | 121 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
122 | |
123 | if (!orig_node) | |
e1a5382f LL |
124 | goto out; |
125 | ||
7351a482 | 126 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 127 | |
e1a5382f | 128 | if (router != neigh_node) |
7351a482 | 129 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
130 | |
131 | out: | |
132 | if (router) | |
25bb2509 | 133 | batadv_neigh_node_put(router); |
c6c8fea2 SE |
134 | } |
135 | ||
62fe710f | 136 | /** |
7e9a8c2c | 137 | * batadv_window_protected() - checks whether the host restarted and is in the |
62fe710f | 138 | * protection time. |
7afcbbef SE |
139 | * @bat_priv: the bat priv with all the soft interface information |
140 | * @seq_num_diff: difference between the current/received sequence number and | |
141 | * the last sequence number | |
81f02683 | 142 | * @seq_old_max_diff: maximum age of sequence number not considered as restart |
7afcbbef SE |
143 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
144 | * is detected | |
81f02683 SW |
145 | * @protection_started: is set to true if the protection window was started, |
146 | * doesn't change otherwise. | |
62fe710f SE |
147 | * |
148 | * Return: | |
4b426b10 SE |
149 | * false if the packet is to be accepted. |
150 | * true if the packet is to be ignored. | |
c6c8fea2 | 151 | */ |
4b426b10 SE |
152 | bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
153 | s32 seq_old_max_diff, unsigned long *last_reset, | |
154 | bool *protection_started) | |
c6c8fea2 | 155 | { |
81f02683 | 156 | if (seq_num_diff <= -seq_old_max_diff || |
42d0b044 SE |
157 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
158 | if (!batadv_has_timed_out(*last_reset, | |
159 | BATADV_RESET_PROTECTION_MS)) | |
4b426b10 | 160 | return true; |
8c7bf248 ML |
161 | |
162 | *last_reset = jiffies; | |
81f02683 SW |
163 | if (protection_started) |
164 | *protection_started = true; | |
39c75a51 | 165 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 166 | "old packet received, start protection\n"); |
c6c8fea2 | 167 | } |
8c7bf248 | 168 | |
4b426b10 | 169 | return false; |
c6c8fea2 SE |
170 | } |
171 | ||
ff15c27c SE |
172 | /** |
173 | * batadv_check_management_packet() - Check preconditions for management packets | |
174 | * @skb: incoming packet buffer | |
175 | * @hard_iface: incoming hard interface | |
176 | * @header_len: minimal header length of packet type | |
177 | * | |
178 | * Return: true when management preconditions are met, false otherwise | |
179 | */ | |
30d3c511 | 180 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 181 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 182 | int header_len) |
c6c8fea2 | 183 | { |
c6c8fea2 SE |
184 | struct ethhdr *ethhdr; |
185 | ||
186 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
187 | if (unlikely(!pskb_may_pull(skb, header_len))) |
188 | return false; | |
c6c8fea2 | 189 | |
7ed4be95 | 190 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
191 | |
192 | /* packet with broadcast indication but unicast recipient */ | |
193 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 194 | return false; |
c6c8fea2 | 195 | |
92eef520 SE |
196 | /* packet with invalid sender address */ |
197 | if (!is_valid_ether_addr(ethhdr->h_source)) | |
c3e29312 | 198 | return false; |
c6c8fea2 SE |
199 | |
200 | /* create a copy of the skb, if needed, to modify it. */ | |
201 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 202 | return false; |
c6c8fea2 SE |
203 | |
204 | /* keep skb linear */ | |
205 | if (skb_linearize(skb) < 0) | |
c3e29312 | 206 | return false; |
c6c8fea2 | 207 | |
c3e29312 | 208 | return true; |
c6c8fea2 SE |
209 | } |
210 | ||
da6b8c20 | 211 | /** |
7e9a8c2c | 212 | * batadv_recv_my_icmp_packet() - receive an icmp packet locally |
da6b8c20 SW |
213 | * @bat_priv: the bat priv with all the soft interface information |
214 | * @skb: icmp packet to process | |
215 | * | |
62fe710f | 216 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
da6b8c20 SW |
217 | * otherwise. |
218 | */ | |
56303d34 | 219 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 220 | struct sk_buff *skb) |
c6c8fea2 | 221 | { |
56303d34 SE |
222 | struct batadv_hard_iface *primary_if = NULL; |
223 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
224 | struct batadv_icmp_header *icmph; |
225 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 226 | |
da6b8c20 | 227 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 228 | |
da6b8c20 SW |
229 | switch (icmph->msg_type) { |
230 | case BATADV_ECHO_REPLY: | |
231 | case BATADV_DESTINATION_UNREACHABLE: | |
232 | case BATADV_TTL_EXCEEDED: | |
233 | /* receive the packet */ | |
234 | if (skb_linearize(skb) < 0) | |
235 | break; | |
c6c8fea2 | 236 | |
da6b8c20 SW |
237 | batadv_socket_receive_packet(icmph, skb->len); |
238 | break; | |
239 | case BATADV_ECHO_REQUEST: | |
240 | /* answer echo request (ping) */ | |
241 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
242 | if (!primary_if) | |
243 | goto out; | |
244 | ||
245 | /* get routing information */ | |
246 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
247 | if (!orig_node) | |
248 | goto out; | |
249 | ||
250 | /* create a copy of the skb, if needed, to modify it. */ | |
251 | if (skb_cow(skb, ETH_HLEN) < 0) | |
252 | goto out; | |
253 | ||
254 | icmph = (struct batadv_icmp_header *)skb->data; | |
255 | ||
8fdd0153 AQ |
256 | ether_addr_copy(icmph->dst, icmph->orig); |
257 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 258 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 259 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
260 | |
261 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
b91a2543 SE |
262 | if (res == NET_XMIT_SUCCESS) |
263 | ret = NET_RX_SUCCESS; | |
da6b8c20 | 264 | |
b91a2543 SE |
265 | /* skb was consumed */ |
266 | skb = NULL; | |
da6b8c20 | 267 | break; |
33a3bb4a AQ |
268 | case BATADV_TP: |
269 | if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet))) | |
270 | goto out; | |
271 | ||
272 | batadv_tp_meter_recv(bat_priv, skb); | |
273 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
274 | /* skb was consumed */ |
275 | skb = NULL; | |
33a3bb4a | 276 | goto out; |
da6b8c20 SW |
277 | default: |
278 | /* drop unknown type */ | |
44524fcd | 279 | goto out; |
da6b8c20 | 280 | } |
44524fcd | 281 | out: |
32ae9b22 | 282 | if (primary_if) |
82047ad7 | 283 | batadv_hardif_put(primary_if); |
44524fcd | 284 | if (orig_node) |
5d967310 | 285 | batadv_orig_node_put(orig_node); |
b91a2543 SE |
286 | |
287 | kfree_skb(skb); | |
288 | ||
c6c8fea2 SE |
289 | return ret; |
290 | } | |
291 | ||
56303d34 | 292 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 293 | struct sk_buff *skb) |
c6c8fea2 | 294 | { |
56303d34 SE |
295 | struct batadv_hard_iface *primary_if = NULL; |
296 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 297 | struct batadv_icmp_packet *icmp_packet; |
f50ca95a | 298 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 299 | |
96412690 | 300 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
301 | |
302 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 303 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 304 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 305 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 306 | goto out; |
c6c8fea2 SE |
307 | } |
308 | ||
e5d89254 | 309 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 310 | if (!primary_if) |
44524fcd | 311 | goto out; |
c6c8fea2 SE |
312 | |
313 | /* get routing information */ | |
27a417e6 | 314 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 315 | if (!orig_node) |
e1a5382f | 316 | goto out; |
c6c8fea2 | 317 | |
44524fcd | 318 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 319 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 320 | goto out; |
c6c8fea2 | 321 | |
96412690 | 322 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 323 | |
8fdd0153 AQ |
324 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
325 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
326 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
327 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 328 | |
f50ca95a | 329 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
b91a2543 SE |
330 | if (res == NET_RX_SUCCESS) |
331 | ret = NET_XMIT_SUCCESS; | |
332 | ||
333 | /* skb was consumed */ | |
334 | skb = NULL; | |
c6c8fea2 | 335 | |
44524fcd | 336 | out: |
32ae9b22 | 337 | if (primary_if) |
82047ad7 | 338 | batadv_hardif_put(primary_if); |
44524fcd | 339 | if (orig_node) |
5d967310 | 340 | batadv_orig_node_put(orig_node); |
b91a2543 SE |
341 | |
342 | kfree_skb(skb); | |
343 | ||
c6c8fea2 SE |
344 | return ret; |
345 | } | |
346 | ||
ff15c27c SE |
347 | /** |
348 | * batadv_recv_icmp_packet() - Process incoming icmp packet | |
349 | * @skb: incoming packet buffer | |
350 | * @recv_if: incoming hard interface | |
351 | * | |
352 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
353 | */ | |
56303d34 SE |
354 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
355 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 356 | { |
56303d34 | 357 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
358 | struct batadv_icmp_header *icmph; |
359 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 360 | struct ethhdr *ethhdr; |
56303d34 | 361 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 362 | int hdr_size = sizeof(struct batadv_icmp_header); |
f50ca95a | 363 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 364 | |
c6c8fea2 SE |
365 | /* drop packet if it has not necessary minimum size */ |
366 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 367 | goto free_skb; |
c6c8fea2 | 368 | |
7ed4be95 | 369 | ethhdr = eth_hdr(skb); |
c6c8fea2 | 370 | |
93bbaab4 SE |
371 | /* packet with unicast indication but non-unicast recipient */ |
372 | if (!is_valid_ether_addr(ethhdr->h_dest)) | |
b91a2543 | 373 | goto free_skb; |
c6c8fea2 | 374 | |
9f75c8e1 SE |
375 | /* packet with broadcast/multicast sender address */ |
376 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
b91a2543 | 377 | goto free_skb; |
c6c8fea2 SE |
378 | |
379 | /* not for me */ | |
fe8a93b9 | 380 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
b91a2543 | 381 | goto free_skb; |
c6c8fea2 | 382 | |
da6b8c20 | 383 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
384 | |
385 | /* add record route information if not full */ | |
da6b8c20 SW |
386 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
387 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
825ffe1f | 388 | skb->len >= sizeof(struct batadv_icmp_packet_rr)) { |
da6b8c20 | 389 | if (skb_linearize(skb) < 0) |
b91a2543 | 390 | goto free_skb; |
da6b8c20 SW |
391 | |
392 | /* create a copy of the skb, if needed, to modify it. */ | |
393 | if (skb_cow(skb, ETH_HLEN) < 0) | |
b91a2543 | 394 | goto free_skb; |
da6b8c20 | 395 | |
3b55e442 | 396 | ethhdr = eth_hdr(skb); |
da6b8c20 SW |
397 | icmph = (struct batadv_icmp_header *)skb->data; |
398 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
399 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
b91a2543 | 400 | goto free_skb; |
da6b8c20 | 401 | |
8fdd0153 AQ |
402 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
403 | ethhdr->h_dest); | |
da6b8c20 | 404 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
405 | } |
406 | ||
407 | /* packet for me */ | |
da6b8c20 SW |
408 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
409 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
410 | |
411 | /* TTL exceeded */ | |
a40d9b07 | 412 | if (icmph->ttl < 2) |
63b01037 | 413 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 414 | |
c6c8fea2 | 415 | /* get routing information */ |
da6b8c20 | 416 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 417 | if (!orig_node) |
b91a2543 | 418 | goto free_skb; |
c6c8fea2 | 419 | |
44524fcd | 420 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 421 | if (skb_cow(skb, ETH_HLEN) < 0) |
b91a2543 | 422 | goto put_orig_node; |
c6c8fea2 | 423 | |
da6b8c20 | 424 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 425 | |
44524fcd | 426 | /* decrement ttl */ |
a40d9b07 | 427 | icmph->ttl--; |
44524fcd ML |
428 | |
429 | /* route it */ | |
f50ca95a | 430 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
b91a2543 SE |
431 | if (res == NET_XMIT_SUCCESS) |
432 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 433 | |
b91a2543 SE |
434 | /* skb was consumed */ |
435 | skb = NULL; | |
436 | ||
437 | put_orig_node: | |
44524fcd | 438 | if (orig_node) |
5d967310 | 439 | batadv_orig_node_put(orig_node); |
b91a2543 SE |
440 | free_skb: |
441 | kfree_skb(skb); | |
442 | ||
c6c8fea2 SE |
443 | return ret; |
444 | } | |
445 | ||
f86ce0ad | 446 | /** |
7e9a8c2c | 447 | * batadv_check_unicast_packet() - Check for malformed unicast packets |
6e0895c2 | 448 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
449 | * @skb: packet to check |
450 | * @hdr_size: size of header to pull | |
451 | * | |
62fe710f SE |
452 | * Check for short header and bad addresses in given packet. |
453 | * | |
454 | * Return: negative value when check fails and 0 otherwise. The negative value | |
455 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
456 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 457 | */ |
fe8a93b9 AQ |
458 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
459 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
460 | { |
461 | struct ethhdr *ethhdr; | |
462 | ||
463 | /* drop packet if it has not necessary minimum size */ | |
464 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 465 | return -ENODATA; |
ff51fd70 | 466 | |
7ed4be95 | 467 | ethhdr = eth_hdr(skb); |
ff51fd70 | 468 | |
93bbaab4 SE |
469 | /* packet with unicast indication but non-unicast recipient */ |
470 | if (!is_valid_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 471 | return -EBADR; |
ff51fd70 | 472 | |
9f75c8e1 SE |
473 | /* packet with broadcast/multicast sender address */ |
474 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 475 | return -EBADR; |
ff51fd70 MH |
476 | |
477 | /* not for me */ | |
fe8a93b9 | 478 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 479 | return -EREMOTE; |
ff51fd70 MH |
480 | |
481 | return 0; | |
482 | } | |
483 | ||
93652344 | 484 | /** |
7e9a8c2c | 485 | * batadv_last_bonding_get() - Get last_bonding_candidate of orig_node |
93652344 SE |
486 | * @orig_node: originator node whose last bonding candidate should be retrieved |
487 | * | |
488 | * Return: last bonding candidate of router or NULL if not found | |
489 | * | |
490 | * The object is returned with refcounter increased by 1. | |
491 | */ | |
492 | static struct batadv_orig_ifinfo * | |
493 | batadv_last_bonding_get(struct batadv_orig_node *orig_node) | |
494 | { | |
495 | struct batadv_orig_ifinfo *last_bonding_candidate; | |
496 | ||
497 | spin_lock_bh(&orig_node->neigh_list_lock); | |
498 | last_bonding_candidate = orig_node->last_bonding_candidate; | |
499 | ||
500 | if (last_bonding_candidate) | |
501 | kref_get(&last_bonding_candidate->refcount); | |
502 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
503 | ||
504 | return last_bonding_candidate; | |
505 | } | |
506 | ||
15c2ed75 | 507 | /** |
7e9a8c2c | 508 | * batadv_last_bonding_replace() - Replace last_bonding_candidate of orig_node |
15c2ed75 SE |
509 | * @orig_node: originator node whose bonding candidates should be replaced |
510 | * @new_candidate: new bonding candidate or NULL | |
511 | */ | |
512 | static void | |
513 | batadv_last_bonding_replace(struct batadv_orig_node *orig_node, | |
514 | struct batadv_orig_ifinfo *new_candidate) | |
515 | { | |
516 | struct batadv_orig_ifinfo *old_candidate; | |
517 | ||
518 | spin_lock_bh(&orig_node->neigh_list_lock); | |
519 | old_candidate = orig_node->last_bonding_candidate; | |
520 | ||
521 | if (new_candidate) | |
522 | kref_get(&new_candidate->refcount); | |
523 | orig_node->last_bonding_candidate = new_candidate; | |
524 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
525 | ||
526 | if (old_candidate) | |
527 | batadv_orig_ifinfo_put(old_candidate); | |
528 | } | |
529 | ||
f6c8b711 | 530 | /** |
7e9a8c2c | 531 | * batadv_find_router() - find a suitable router for this originator |
f6c8b711 SW |
532 | * @bat_priv: the bat priv with all the soft interface information |
533 | * @orig_node: the destination node | |
534 | * @recv_if: pointer to interface this packet was received on | |
535 | * | |
62fe710f | 536 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 537 | * this interface, or NULL if not available. |
9cfc7bd6 | 538 | */ |
56303d34 SE |
539 | struct batadv_neigh_node * |
540 | batadv_find_router(struct batadv_priv *bat_priv, | |
541 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 542 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 543 | { |
29824a55 | 544 | struct batadv_algo_ops *bao = bat_priv->algo_ops; |
f3b3d901 SW |
545 | struct batadv_neigh_node *first_candidate_router = NULL; |
546 | struct batadv_neigh_node *next_candidate_router = NULL; | |
547 | struct batadv_neigh_node *router, *cand_router = NULL; | |
548 | struct batadv_neigh_node *last_cand_router = NULL; | |
549 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
550 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
551 | struct batadv_orig_ifinfo *last_candidate; | |
552 | bool last_candidate_found = false; | |
c6c8fea2 SE |
553 | |
554 | if (!orig_node) | |
555 | return NULL; | |
556 | ||
7351a482 | 557 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 558 | |
329887ad SW |
559 | if (!router) |
560 | return router; | |
561 | ||
f3b3d901 SW |
562 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
563 | * and if activated. | |
564 | */ | |
329887ad | 565 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
566 | return router; |
567 | ||
568 | /* bonding: loop through the list of possible routers found | |
569 | * for the various outgoing interfaces and find a candidate after | |
570 | * the last chosen bonding candidate (next_candidate). If no such | |
571 | * router is found, use the first candidate found (the previously | |
572 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 573 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
574 | * router - obviously there are no other candidates. |
575 | */ | |
576 | rcu_read_lock(); | |
93652344 | 577 | last_candidate = batadv_last_bonding_get(orig_node); |
f3b3d901 SW |
578 | if (last_candidate) |
579 | last_cand_router = rcu_dereference(last_candidate->router); | |
580 | ||
581 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
582 | /* acquire some structures and references ... */ | |
a6ba0d34 | 583 | if (!kref_get_unless_zero(&cand->refcount)) |
f3b3d901 SW |
584 | continue; |
585 | ||
586 | cand_router = rcu_dereference(cand->router); | |
587 | if (!cand_router) | |
588 | goto next; | |
589 | ||
77ae32e8 | 590 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
f3b3d901 SW |
591 | cand_router = NULL; |
592 | goto next; | |
593 | } | |
594 | ||
595 | /* alternative candidate should be good enough to be | |
596 | * considered | |
597 | */ | |
29824a55 AQ |
598 | if (!bao->neigh.is_similar_or_better(cand_router, |
599 | cand->if_outgoing, router, | |
600 | recv_if)) | |
f3b3d901 SW |
601 | goto next; |
602 | ||
603 | /* don't use the same router twice */ | |
604 | if (last_cand_router == cand_router) | |
605 | goto next; | |
606 | ||
607 | /* mark the first possible candidate */ | |
608 | if (!first_candidate) { | |
77ae32e8 | 609 | kref_get(&cand_router->refcount); |
a6ba0d34 | 610 | kref_get(&cand->refcount); |
f3b3d901 SW |
611 | first_candidate = cand; |
612 | first_candidate_router = cand_router; | |
613 | } | |
614 | ||
615 | /* check if the loop has already passed the previously selected | |
616 | * candidate ... this function should select the next candidate | |
617 | * AFTER the previously used bonding candidate. | |
618 | */ | |
619 | if (!last_candidate || last_candidate_found) { | |
620 | next_candidate = cand; | |
621 | next_candidate_router = cand_router; | |
622 | break; | |
623 | } | |
624 | ||
625 | if (last_candidate == cand) | |
626 | last_candidate_found = true; | |
627 | next: | |
628 | /* free references */ | |
629 | if (cand_router) { | |
25bb2509 | 630 | batadv_neigh_node_put(cand_router); |
f3b3d901 SW |
631 | cand_router = NULL; |
632 | } | |
35f94779 | 633 | batadv_orig_ifinfo_put(cand); |
f3b3d901 SW |
634 | } |
635 | rcu_read_unlock(); | |
636 | ||
f3b3d901 SW |
637 | /* After finding candidates, handle the three cases: |
638 | * 1) there is a next candidate, use that | |
639 | * 2) there is no next candidate, use the first of the list | |
640 | * 3) there is no candidate at all, return the default router | |
641 | */ | |
642 | if (next_candidate) { | |
25bb2509 | 643 | batadv_neigh_node_put(router); |
f3b3d901 | 644 | |
15c2ed75 | 645 | kref_get(&next_candidate_router->refcount); |
f3b3d901 | 646 | router = next_candidate_router; |
15c2ed75 | 647 | batadv_last_bonding_replace(orig_node, next_candidate); |
f3b3d901 | 648 | } else if (first_candidate) { |
25bb2509 | 649 | batadv_neigh_node_put(router); |
f3b3d901 | 650 | |
15c2ed75 | 651 | kref_get(&first_candidate_router->refcount); |
f3b3d901 | 652 | router = first_candidate_router; |
15c2ed75 | 653 | batadv_last_bonding_replace(orig_node, first_candidate); |
f3b3d901 | 654 | } else { |
15c2ed75 SE |
655 | batadv_last_bonding_replace(orig_node, NULL); |
656 | } | |
657 | ||
658 | /* cleanup of candidates */ | |
659 | if (first_candidate) { | |
660 | batadv_neigh_node_put(first_candidate_router); | |
661 | batadv_orig_ifinfo_put(first_candidate); | |
662 | } | |
663 | ||
664 | if (next_candidate) { | |
665 | batadv_neigh_node_put(next_candidate_router); | |
666 | batadv_orig_ifinfo_put(next_candidate); | |
f3b3d901 | 667 | } |
f6c8b711 | 668 | |
93652344 SE |
669 | if (last_candidate) |
670 | batadv_orig_ifinfo_put(last_candidate); | |
671 | ||
c6c8fea2 SE |
672 | return router; |
673 | } | |
674 | ||
63b01037 | 675 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 676 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 677 | { |
56303d34 SE |
678 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
679 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 680 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 681 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 682 | int res, hdr_len, ret = NET_RX_DROP; |
63d443ef | 683 | unsigned int len; |
c6c8fea2 | 684 | |
96412690 | 685 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
686 | |
687 | /* TTL exceeded */ | |
a40d9b07 | 688 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
689 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
690 | ethhdr->h_source, unicast_packet->dest); | |
b91a2543 | 691 | goto free_skb; |
c6c8fea2 SE |
692 | } |
693 | ||
694 | /* get routing information */ | |
da641193 | 695 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 696 | |
44524fcd | 697 | if (!orig_node) |
b91a2543 | 698 | goto free_skb; |
c6c8fea2 | 699 | |
c6c8fea2 | 700 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 701 | if (skb_cow(skb, ETH_HLEN) < 0) |
b91a2543 | 702 | goto put_orig_node; |
c6c8fea2 | 703 | |
c6c8fea2 | 704 | /* decrement ttl */ |
f097e25d | 705 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 706 | unicast_packet->ttl--; |
c6c8fea2 | 707 | |
a40d9b07 | 708 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
709 | case BATADV_UNICAST_4ADDR: |
710 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
711 | break; | |
712 | case BATADV_UNICAST: | |
713 | hdr_len = sizeof(struct batadv_unicast_packet); | |
714 | break; | |
715 | default: | |
716 | /* other packet types not supported - yet */ | |
717 | hdr_len = -1; | |
718 | break; | |
719 | } | |
720 | ||
721 | if (hdr_len > 0) | |
722 | batadv_skb_set_priority(skb, hdr_len); | |
723 | ||
63d443ef | 724 | len = skb->len; |
e91ecfc6 | 725 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 726 | |
e91ecfc6 MH |
727 | /* translate transmit result into receive result */ |
728 | if (res == NET_XMIT_SUCCESS) { | |
0843f197 | 729 | ret = NET_RX_SUCCESS; |
e91ecfc6 | 730 | /* skb was transmitted and consumed */ |
95332477 MH |
731 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
732 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
63d443ef | 733 | len + ETH_HLEN); |
95332477 | 734 | } |
c6c8fea2 | 735 | |
0843f197 GF |
736 | /* skb was consumed */ |
737 | skb = NULL; | |
738 | ||
b91a2543 SE |
739 | put_orig_node: |
740 | batadv_orig_node_put(orig_node); | |
741 | free_skb: | |
742 | kfree_skb(skb); | |
f50ca95a | 743 | |
44524fcd | 744 | return ret; |
c6c8fea2 SE |
745 | } |
746 | ||
7c1fd91d | 747 | /** |
7e9a8c2c | 748 | * batadv_reroute_unicast_packet() - update the unicast header for re-routing |
7c1fd91d | 749 | * @bat_priv: the bat priv with all the soft interface information |
fc04fdb2 | 750 | * @skb: unicast packet to process |
7c1fd91d AQ |
751 | * @unicast_packet: the unicast header to be updated |
752 | * @dst_addr: the payload destination | |
c018ad3d | 753 | * @vid: VLAN identifier |
7c1fd91d AQ |
754 | * |
755 | * Search the translation table for dst_addr and update the unicast header with | |
756 | * the new corresponding information (originator address where the destination | |
757 | * client currently is and its known TTVN) | |
758 | * | |
62fe710f | 759 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
760 | */ |
761 | static bool | |
fc04fdb2 | 762 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
7c1fd91d | 763 | struct batadv_unicast_packet *unicast_packet, |
6b5e971a | 764 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
765 | { |
766 | struct batadv_orig_node *orig_node = NULL; | |
767 | struct batadv_hard_iface *primary_if = NULL; | |
768 | bool ret = false; | |
6b5e971a | 769 | u8 *orig_addr, orig_ttvn; |
7c1fd91d | 770 | |
c018ad3d | 771 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
772 | primary_if = batadv_primary_if_get_selected(bat_priv); |
773 | if (!primary_if) | |
774 | goto out; | |
775 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 776 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 777 | } else { |
c018ad3d AQ |
778 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
779 | vid); | |
7c1fd91d AQ |
780 | if (!orig_node) |
781 | goto out; | |
782 | ||
783 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
784 | goto out; | |
785 | ||
786 | orig_addr = orig_node->orig; | |
6b5e971a | 787 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
788 | } |
789 | ||
790 | /* update the packet header */ | |
fc04fdb2 | 791 | skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
8fdd0153 | 792 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d | 793 | unicast_packet->ttvn = orig_ttvn; |
fc04fdb2 | 794 | skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
7c1fd91d AQ |
795 | |
796 | ret = true; | |
797 | out: | |
798 | if (primary_if) | |
82047ad7 | 799 | batadv_hardif_put(primary_if); |
7c1fd91d | 800 | if (orig_node) |
5d967310 | 801 | batadv_orig_node_put(orig_node); |
7c1fd91d AQ |
802 | |
803 | return ret; | |
804 | } | |
805 | ||
4b426b10 SE |
806 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
807 | struct sk_buff *skb, int hdr_len) | |
808 | { | |
c018ad3d AQ |
809 | struct batadv_unicast_packet *unicast_packet; |
810 | struct batadv_hard_iface *primary_if; | |
56303d34 | 811 | struct batadv_orig_node *orig_node; |
6b5e971a | 812 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 813 | struct ethhdr *ethhdr; |
c018ad3d | 814 | unsigned short vid; |
3e34819e | 815 | int is_old_ttvn; |
a73105b8 | 816 | |
b8fcfa42 | 817 | /* check if there is enough data before accessing it */ |
f1791425 | 818 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
4b426b10 | 819 | return false; |
b8fcfa42 AQ |
820 | |
821 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
822 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
4b426b10 | 823 | return false; |
a73105b8 | 824 | |
96412690 | 825 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 826 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 827 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 828 | |
7c1fd91d AQ |
829 | /* check if the destination client was served by this node and it is now |
830 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
831 | * message and that it knows the new destination in the mesh to re-route | |
832 | * the packet to | |
833 | */ | |
c018ad3d | 834 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
fc04fdb2 | 835 | if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, |
c018ad3d | 836 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
837 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
838 | bat_priv, | |
839 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
840 | unicast_packet->dest, | |
841 | ethhdr->h_dest); | |
7c1fd91d AQ |
842 | /* at this point the mesh destination should have been |
843 | * substituted with the originator address found in the global | |
844 | * table. If not, let the packet go untouched anyway because | |
845 | * there is nothing the node can do | |
846 | */ | |
4b426b10 | 847 | return true; |
7c1fd91d AQ |
848 | } |
849 | ||
850 | /* retrieve the TTVN known by this node for the packet destination. This | |
851 | * value is used later to check if the node which sent (or re-routed | |
852 | * last time) the packet had an updated information or not | |
853 | */ | |
6b5e971a | 854 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 855 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
856 | orig_node = batadv_orig_hash_find(bat_priv, |
857 | unicast_packet->dest); | |
7c1fd91d AQ |
858 | /* if it is not possible to find the orig_node representing the |
859 | * destination, the packet can immediately be dropped as it will | |
860 | * not be possible to deliver it | |
861 | */ | |
a73105b8 | 862 | if (!orig_node) |
4b426b10 | 863 | return false; |
a73105b8 | 864 | |
6b5e971a | 865 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
5d967310 | 866 | batadv_orig_node_put(orig_node); |
a73105b8 AQ |
867 | } |
868 | ||
7c1fd91d AQ |
869 | /* check if the TTVN contained in the packet is fresher than what the |
870 | * node knows | |
871 | */ | |
3e34819e | 872 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d | 873 | if (!is_old_ttvn) |
4b426b10 | 874 | return true; |
a73105b8 | 875 | |
7c1fd91d AQ |
876 | old_ttvn = unicast_packet->ttvn; |
877 | /* the packet was forged based on outdated network information. Its | |
878 | * destination can possibly be updated and forwarded towards the new | |
879 | * target host | |
880 | */ | |
fc04fdb2 | 881 | if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, |
c018ad3d | 882 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
883 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
884 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
885 | unicast_packet->dest, ethhdr->h_dest, | |
886 | old_ttvn, curr_ttvn); | |
4b426b10 | 887 | return true; |
7c1fd91d | 888 | } |
3275e7cc | 889 | |
7c1fd91d AQ |
890 | /* the packet has not been re-routed: either the destination is |
891 | * currently served by this node or there is no destination at all and | |
892 | * it is possible to drop the packet | |
893 | */ | |
c018ad3d | 894 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
4b426b10 | 895 | return false; |
3275e7cc | 896 | |
7c1fd91d AQ |
897 | /* update the header in order to let the packet be delivered to this |
898 | * node's soft interface | |
899 | */ | |
900 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
901 | if (!primary_if) | |
4b426b10 | 902 | return false; |
a73105b8 | 903 | |
fc04fdb2 SE |
904 | /* update the packet header */ |
905 | skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); | |
8fdd0153 | 906 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
fc04fdb2 SE |
907 | unicast_packet->ttvn = curr_ttvn; |
908 | skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); | |
7c1fd91d | 909 | |
82047ad7 | 910 | batadv_hardif_put(primary_if); |
7c1fd91d | 911 | |
4b426b10 | 912 | return true; |
a73105b8 AQ |
913 | } |
914 | ||
a1f1ac5c | 915 | /** |
7e9a8c2c | 916 | * batadv_recv_unhandled_unicast_packet() - receive and process packets which |
a1f1ac5c SW |
917 | * are in the unicast number space but not yet known to the implementation |
918 | * @skb: unicast tvlv packet to process | |
919 | * @recv_if: pointer to interface this packet was received on | |
920 | * | |
62fe710f | 921 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
922 | * otherwise. |
923 | */ | |
924 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
925 | struct batadv_hard_iface *recv_if) | |
926 | { | |
927 | struct batadv_unicast_packet *unicast_packet; | |
928 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
929 | int check, hdr_size = sizeof(*unicast_packet); | |
930 | ||
931 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
932 | if (check < 0) | |
b91a2543 | 933 | goto free_skb; |
a1f1ac5c SW |
934 | |
935 | /* we don't know about this type, drop it. */ | |
936 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
937 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
b91a2543 | 938 | goto free_skb; |
a1f1ac5c SW |
939 | |
940 | return batadv_route_unicast_packet(skb, recv_if); | |
b91a2543 SE |
941 | |
942 | free_skb: | |
943 | kfree_skb(skb); | |
944 | return NET_RX_DROP; | |
a1f1ac5c SW |
945 | } |
946 | ||
ff15c27c SE |
947 | /** |
948 | * batadv_recv_unicast_packet() - Process incoming unicast packet | |
949 | * @skb: incoming packet buffer | |
950 | * @recv_if: incoming hard interface | |
951 | * | |
952 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
953 | */ | |
56303d34 SE |
954 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
955 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 956 | { |
56303d34 | 957 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 958 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 959 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9e794b6b AP |
960 | u8 *orig_addr, *orig_addr_gw; |
961 | struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL; | |
612d2b4f | 962 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 963 | enum batadv_subtype subtype; |
b91a2543 | 964 | int ret = NET_RX_DROP; |
9e794b6b | 965 | bool is4addr, is_gw; |
c6c8fea2 | 966 | |
7cdcf6dd | 967 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 968 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 969 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 970 | if (is4addr) |
4046b24a | 971 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 972 | |
612d2b4f | 973 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 974 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
975 | |
976 | /* Even though the packet is not for us, we might save it to use for | |
977 | * decoding a later received coded packet | |
978 | */ | |
979 | if (check == -EREMOTE) | |
980 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
981 | ||
982 | if (check < 0) | |
b91a2543 | 983 | goto free_skb; |
dd981ab0 | 984 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
b91a2543 | 985 | goto free_skb; |
a73105b8 | 986 | |
bc44b781 MS |
987 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
988 | ||
c6c8fea2 | 989 | /* packet for me */ |
fe8a93b9 | 990 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9e794b6b AP |
991 | /* If this is a unicast packet from another backgone gw, |
992 | * drop it. | |
993 | */ | |
bc44b781 | 994 | orig_addr_gw = eth_hdr(skb)->h_source; |
9e794b6b AP |
995 | orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw); |
996 | if (orig_node_gw) { | |
997 | is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, | |
998 | hdr_size); | |
999 | batadv_orig_node_put(orig_node_gw); | |
1000 | if (is_gw) { | |
1001 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
1002 | "%s(): Dropped unicast pkt received from another backbone gw %pM.\n", |
1003 | __func__, orig_addr_gw); | |
a1a745ef | 1004 | goto free_skb; |
9e794b6b AP |
1005 | } |
1006 | } | |
1007 | ||
9affec6b | 1008 | if (is4addr) { |
bc44b781 MS |
1009 | unicast_4addr_packet = |
1010 | (struct batadv_unicast_4addr_packet *)skb->data; | |
437bb0e6 SW |
1011 | subtype = unicast_4addr_packet->subtype; |
1012 | batadv_dat_inc_counter(bat_priv, subtype); | |
1013 | ||
1014 | /* Only payload data should be considered for speedy | |
1015 | * join. For example, DAT also uses unicast 4addr | |
1016 | * types, but those packets should not be considered | |
1017 | * for speedy join, since the clients do not actually | |
1018 | * reside at the sending originator. | |
1019 | */ | |
1020 | if (subtype == BATADV_P_DATA) { | |
1021 | orig_addr = unicast_4addr_packet->src; | |
1022 | orig_node = batadv_orig_hash_find(bat_priv, | |
1023 | orig_addr); | |
1024 | } | |
9affec6b | 1025 | } |
4046b24a | 1026 | |
c384ea3e AQ |
1027 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1028 | hdr_size)) | |
1029 | goto rx_success; | |
1030 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1031 | hdr_size)) | |
1032 | goto rx_success; | |
1033 | ||
b61ec31c LL |
1034 | batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
1035 | ||
6535db56 | 1036 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
9affec6b | 1037 | orig_node); |
37135173 | 1038 | |
c384ea3e | 1039 | rx_success: |
9affec6b | 1040 | if (orig_node) |
5d967310 | 1041 | batadv_orig_node_put(orig_node); |
9affec6b | 1042 | |
c6c8fea2 SE |
1043 | return NET_RX_SUCCESS; |
1044 | } | |
1045 | ||
b91a2543 SE |
1046 | ret = batadv_route_unicast_packet(skb, recv_if); |
1047 | /* skb was consumed */ | |
1048 | skb = NULL; | |
1049 | ||
1050 | free_skb: | |
1051 | kfree_skb(skb); | |
1052 | ||
1053 | return ret; | |
c6c8fea2 SE |
1054 | } |
1055 | ||
ef261577 | 1056 | /** |
7e9a8c2c | 1057 | * batadv_recv_unicast_tvlv() - receive and process unicast tvlv packets |
ef261577 ML |
1058 | * @skb: unicast tvlv packet to process |
1059 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 1060 | * |
62fe710f | 1061 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
1062 | * otherwise. |
1063 | */ | |
1064 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
1065 | struct batadv_hard_iface *recv_if) | |
1066 | { | |
1067 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1068 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1069 | unsigned char *tvlv_buff; | |
6b5e971a | 1070 | u16 tvlv_buff_len; |
ef261577 ML |
1071 | int hdr_size = sizeof(*unicast_tvlv_packet); |
1072 | int ret = NET_RX_DROP; | |
1073 | ||
1074 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
b91a2543 | 1075 | goto free_skb; |
ef261577 ML |
1076 | |
1077 | /* the header is likely to be modified while forwarding */ | |
1078 | if (skb_cow(skb, hdr_size) < 0) | |
b91a2543 | 1079 | goto free_skb; |
ef261577 ML |
1080 | |
1081 | /* packet needs to be linearized to access the tvlv content */ | |
1082 | if (skb_linearize(skb) < 0) | |
b91a2543 | 1083 | goto free_skb; |
ef261577 ML |
1084 | |
1085 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1086 | ||
1087 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1088 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1089 | ||
1090 | if (tvlv_buff_len > skb->len - hdr_size) | |
b91a2543 | 1091 | goto free_skb; |
ef261577 ML |
1092 | |
1093 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1094 | unicast_tvlv_packet->src, | |
1095 | unicast_tvlv_packet->dst, | |
1096 | tvlv_buff, tvlv_buff_len); | |
1097 | ||
b91a2543 | 1098 | if (ret != NET_RX_SUCCESS) { |
ef261577 | 1099 | ret = batadv_route_unicast_packet(skb, recv_if); |
b91a2543 SE |
1100 | /* skb was consumed */ |
1101 | skb = NULL; | |
1102 | } | |
1103 | ||
1104 | free_skb: | |
1105 | kfree_skb(skb); | |
ef261577 ML |
1106 | |
1107 | return ret; | |
1108 | } | |
c6c8fea2 | 1109 | |
610bfc6b | 1110 | /** |
7e9a8c2c | 1111 | * batadv_recv_frag_packet() - process received fragment |
610bfc6b MH |
1112 | * @skb: the received fragment |
1113 | * @recv_if: interface that the skb is received on | |
1114 | * | |
1115 | * This function does one of the three following things: 1) Forward fragment, if | |
1116 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1117 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1118 | * | |
62fe710f | 1119 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
1120 | */ |
1121 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1122 | struct batadv_hard_iface *recv_if) | |
1123 | { | |
1124 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1125 | struct batadv_orig_node *orig_node_src = NULL; | |
1126 | struct batadv_frag_packet *frag_packet; | |
1127 | int ret = NET_RX_DROP; | |
1128 | ||
1129 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1130 | sizeof(*frag_packet)) < 0) | |
b91a2543 | 1131 | goto free_skb; |
610bfc6b MH |
1132 | |
1133 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1134 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1135 | if (!orig_node_src) | |
b91a2543 | 1136 | goto free_skb; |
610bfc6b | 1137 | |
c0f25c80 AL |
1138 | skb->priority = frag_packet->priority + 256; |
1139 | ||
610bfc6b MH |
1140 | /* Route the fragment if it is not for us and too big to be merged. */ |
1141 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1142 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
b91a2543 SE |
1143 | /* skb was consumed */ |
1144 | skb = NULL; | |
610bfc6b | 1145 | ret = NET_RX_SUCCESS; |
b91a2543 | 1146 | goto put_orig_node; |
610bfc6b MH |
1147 | } |
1148 | ||
1149 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1150 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1151 | ||
1152 | /* Add fragment to buffer and merge if possible. */ | |
1153 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
b91a2543 | 1154 | goto put_orig_node; |
610bfc6b MH |
1155 | |
1156 | /* Deliver merged packet to the appropriate handler, if it was | |
1157 | * merged | |
1158 | */ | |
b91a2543 | 1159 | if (skb) { |
610bfc6b MH |
1160 | batadv_batman_skb_recv(skb, recv_if->net_dev, |
1161 | &recv_if->batman_adv_ptype, NULL); | |
b91a2543 SE |
1162 | /* skb was consumed */ |
1163 | skb = NULL; | |
1164 | } | |
610bfc6b MH |
1165 | |
1166 | ret = NET_RX_SUCCESS; | |
1167 | ||
b91a2543 SE |
1168 | put_orig_node: |
1169 | batadv_orig_node_put(orig_node_src); | |
1170 | free_skb: | |
1171 | kfree_skb(skb); | |
610bfc6b MH |
1172 | |
1173 | return ret; | |
1174 | } | |
1175 | ||
ff15c27c SE |
1176 | /** |
1177 | * batadv_recv_bcast_packet() - Process incoming broadcast packet | |
1178 | * @skb: incoming packet buffer | |
1179 | * @recv_if: incoming hard interface | |
1180 | * | |
1181 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
1182 | */ | |
56303d34 SE |
1183 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1184 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1185 | { |
56303d34 SE |
1186 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1187 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1188 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1189 | struct ethhdr *ethhdr; |
704509b8 | 1190 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1191 | int ret = NET_RX_DROP; |
6b5e971a SE |
1192 | s32 seq_diff; |
1193 | u32 seqno; | |
c6c8fea2 SE |
1194 | |
1195 | /* drop packet if it has not necessary minimum size */ | |
1196 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 1197 | goto free_skb; |
c6c8fea2 | 1198 | |
7ed4be95 | 1199 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1200 | |
1201 | /* packet with broadcast indication but unicast recipient */ | |
1202 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
b91a2543 | 1203 | goto free_skb; |
c6c8fea2 | 1204 | |
9f75c8e1 SE |
1205 | /* packet with broadcast/multicast sender address */ |
1206 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
b91a2543 | 1207 | goto free_skb; |
c6c8fea2 SE |
1208 | |
1209 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1210 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
b91a2543 | 1211 | goto free_skb; |
c6c8fea2 | 1212 | |
96412690 | 1213 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1214 | |
1215 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1216 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
b91a2543 | 1217 | goto free_skb; |
c6c8fea2 | 1218 | |
a40d9b07 | 1219 | if (bcast_packet->ttl < 2) |
b91a2543 | 1220 | goto free_skb; |
c6c8fea2 | 1221 | |
da641193 | 1222 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1223 | |
1224 | if (!orig_node) | |
b91a2543 | 1225 | goto free_skb; |
c6c8fea2 | 1226 | |
f3e0008f | 1227 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1228 | |
3fba7325 | 1229 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1230 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1231 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1232 | seqno)) |
f3e0008f | 1233 | goto spin_unlock; |
c6c8fea2 | 1234 | |
3fba7325 | 1235 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1236 | |
1237 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 | 1238 | if (batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1239 | BATADV_BCAST_MAX_AGE, |
1240 | &orig_node->bcast_seqno_reset, NULL)) | |
f3e0008f | 1241 | goto spin_unlock; |
c6c8fea2 SE |
1242 | |
1243 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1244 | * if required. |
1245 | */ | |
0f5f9322 | 1246 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1247 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1248 | |
f3e0008f | 1249 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1250 | |
fe2da6ff | 1251 | /* check whether this has been sent by another originator before */ |
004e86fc | 1252 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
b91a2543 | 1253 | goto free_skb; |
fe2da6ff | 1254 | |
c54f38c9 SW |
1255 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1256 | ||
c6c8fea2 | 1257 | /* rebroadcast packet */ |
3111beed | 1258 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1, false); |
c6c8fea2 | 1259 | |
23721387 SW |
1260 | /* don't hand the broadcast up if it is from an originator |
1261 | * from the same backbone. | |
1262 | */ | |
08adf151 | 1263 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
b91a2543 | 1264 | goto free_skb; |
23721387 | 1265 | |
c384ea3e AQ |
1266 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1267 | goto rx_success; | |
1268 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1269 | goto rx_success; | |
1270 | ||
b61ec31c LL |
1271 | batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
1272 | ||
c6c8fea2 | 1273 | /* broadcast for me */ |
6535db56 | 1274 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
c384ea3e AQ |
1275 | |
1276 | rx_success: | |
f3e0008f ML |
1277 | ret = NET_RX_SUCCESS; |
1278 | goto out; | |
c6c8fea2 | 1279 | |
f3e0008f ML |
1280 | spin_unlock: |
1281 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
b91a2543 SE |
1282 | free_skb: |
1283 | kfree_skb(skb); | |
f3e0008f ML |
1284 | out: |
1285 | if (orig_node) | |
5d967310 | 1286 | batadv_orig_node_put(orig_node); |
f3e0008f | 1287 | return ret; |
c6c8fea2 | 1288 | } |